Embree, Emersyn, or Callahan?

Okay, I know my naming style doesn't jive with many, and that is okay. I tend to like names that are unisex, trendy, and I don't mind non-traditional spellings. So, I have narrowed the list to three. I would like opinions on which goes best with the siblings and which name ages best.

None of your names are my style and I'm not a fan of kre8tif spellings. Incorrect spellings seem forever juvenile to me and don't age well. Callahan is the only one that's spelled correctly. It's a tad too surnamey and similar to Camden and Kason. Embree just looks like two sounds smooshed together. Emersyn is just bad and I don't understand why people think changing the spelling somehow makes a boys name more feminine. I'm going to have to go with Callahan. At least you can call her Calla for a nn.

Embree, Callahan, Emersyn... hm... I am not a fan of unisex names generally, but the only one of these three I really dislike is Callahan. Embree is fine, though I would spell it Embry or Embrie. Emersyn is also fine, but I would spell it Emerson.